3
MgCl2 + N2 = Mg3N2 + 3 Cl2
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water [H20]
n2 = 20 + n so n2 - n - 20 = 0 that is (n - 5)(n + 4) = 0 so that n - 5 = 0 or n + 4 = 0 n = 5 or n = -4
Absallutly!
n=40 n2+n+41=1681 which is not a prime.
MgCl2 aq plus Zn s is the oxidation half-reaction for Mg s plus ZnCl2 aq.